Window shade

Abstract: A window covering is described wherein at least one translucent or transparent sheet (60) is suspended vertically and has a plurality of parallel vanes (56) projecting rearwardly therefrom. The vanes are formed from fabric material which has either been rigidified with a rigidifying compound or rigidified by the formation of a pocket into which a rigid slat is inserted. Variations are provided for varying the flexibility of a hinge defined along a juncture line between the vanes and the fabric sheet.

Description: The present invention relates to window shades. US-A-4450027 discloses cellular window coverings which may be made of fabric or film materials. A flexible strip of material is folded into a continuous longitudinal tube and the longitudinal folds thus created are permanently set by passing the tube around a heat setting wheel. Adhesive is applied along one side of the flattened tubular material which is subsequently stacked by winding onto a rack having flat surfaces. The winding in this manner presses the adhesive to the next layer wound onto the rack to form a bonded unitary stack of closed tubular cells. When the ends are cut from the rack, the stack may be expanded and the permanently set creases provide a neat and uniform outward appearance. US-A-4732630 discloses a modification in which hot melted adhesive is applied to one side of the tubular material. After the flat tubular strips have been stacked and cut, they are placed in an oven under pressure and the hot melted adhesive is activated to bond the layers together. Both of the above window coverings have a softer appearance than conventional venetian blinds and good insulating properties. However, they do not have the ability to control the amount of light admitted through the window covering, similar to a traditional venetian blind. US-A-3384519 attempts to overcome this and discloses two cloth layers spaced apart by moveable parallel and flexible fabric vanes having each of their marginal edges heat welded to one of the moveable cloth layers. With this window covering, relative movement of the two cloth layers in a direction perpendicular to the vanes changes the angle of the vanes and thus controls the amount of light admitted through the article. Heat welding necessarily requires a melting of at least some of the fibres of the materials bonded, thus providing an uneven outer appearance along the heat welds and producing unwanted crimps or creases in the materials which can result in failure of the fabric fibres. Further, heat welding is a relatively slow process which may require six or more seconds to create a bond over an extended length, which is unacceptable for commercial production. Furthermore, the heat welds are limited in strength and it is difficult to achieve uniformly straight heat-welded joints over an extended length. US-A-2865446 discloses a window covering in which a long rectangular piece of fabric is doubled back upon itself and a plurality of accordion-pleated fabric elements are placed between the folded-over sheets. Such a window covering does not provide a uniform appearance because the accordion-pleated fabric located close to the top of the window covering does not expand to the same extent as the fabric closer to the bottom of the window covering. Also, it is very difficult to insure that such accordion-pleated fabric returns to its desired position after each expansion. FR-A-1309194 discloses a curtain with variable opacity. In this curtain, screen or mesh parallel sides are provided with tiltable braids therebetween. The braids are said to be attached at their edges to the sides. However, no means for attachment is specified. The drawings appear to indicate a hinged-type attachment and the specification ends by stating that the difficulties of construction are substantial. US-A-4535828 shows a window insulator wherein a sheet of insulating material having encapsulated bubbles is appropriately slit and folded upon itself to form pivotal vanes. The insulating material is of the type commonly used as a stuffer in packaging. The vanes are supported along one edge by the sheet of material from which they are formed and along an opposite edge by flexible strands. US-A-2577227; 4309472 and 1937342; GB-A-1994842; DE-A-3525515 and FR-A-1465251 show various other structures of this general type. The precharacterising portion of appended claim I is based on the teaching of US 1937342. It is an object of the present invention to provide an improved form of window shade which is capable of being adjusted to control the passage of light therethrough, is inexpensive to manufacture, and yet still has a pleasing aesthetic effect. According to the present invention there is provided an article for use in fabricating a window covering assembly, comprising: a first sheet and a second sheet each having a width dimension and a longitudinal axis, said first and second sheets being spaced from one another, a plurality of longitudinally spaced vanes extending between said first and second sheets, each of said vanes being formed with a first side having opposed first and second ends and a second side having opposed first and second ends, said first ends of said first and second sides being connected to said first sheet and said second ends of said first and second sides being connected to the second sheet, said first and second sides of each said vanes extending substantially parallel to one another between said first and second sheets; characterised in that all of said vanes are each formed by folding a portion of said second sheet upon itself and joining it to form a plurality of substantially flattened loops thereby defining said first side and said second side having a free edge defined by said first ends and a juncture edge defined by said second ends. In order that the present invention may more readily be understood, the following description is given, merely by way of example, reference being made to the accompanying drawings in which:- Figure 1 is a fragmentary isometric view of a window covering associated with the present invention. Figure 2 is an enlarged fragmentary section taken along line 2-2 of Figure 1. Figure 3 is an enlarged fragmentary section taken along line 3-3 of Figure 1. Figure 4 is a further enlarged fragmentary section taken along line 4-4 of Figure 3. Figure 5 is yet a further enlarged section taken along line 5-5 of Figure 4. Figure 6A is an enlarged fragmentary section taken along line 6-6 of Figure 3. Figure 6B is a view similar to Figure 6A showing a multiple fold variation of the window covering. Figure 7 is a fragmentary horizontal section showing the vanes in the closed condition of the window covering. Figure 8 is a fragmentary horizontal section showing the vanes in the open condition of the window covering and with the vanes shifted into closely adjacent side-by-side relationship. Figure 9 is a fragmentary isometric view showing two vanes and the sheet in an open condition. Figure 10 is a fragmentary isometric view similar to Figure 9 with the vanes in a closed position. Figure 11 is a fragmentary isometric view showing the vanes in an open position and moved into closely adjacent side-by-side relationship. Figure 12 is a transverse fragmentary section taken through a vane in a first arrangement of a first embodiment of the invention showing a compressed juncture line between the vane and the fabric sheet. Figure 13 is an enlarged fragmentary transverse section showing the juncture line between the vane and the sheet. Figure 14 is a fragmentary transverse section showing two adjacent vanes in an open condition and in accordance with the arrangement shown in Figures 12 and 13. Figure 15 is a fragmentary section similar to Figure 14 with the vanes in a closed condition. Figure 16 is a transverse fragmentary section taken through a vane illustrating a second arrangement of the first embodiment of the invention. Figure 17 is an enlarged fragmentary section similar to Figure 16 showing the juncture line between the vane and the sheet. Figure 18 is a fragmentary transverse section showing two vanes in an open condition fabricated in accordance with Figures 16 and 17. Figure 19 is a fragmentary section similar to Figure 18 with the vanes in a closed condition. Figure 20 is an enlarged fragmentary isometric view showing a third arrangement of the first embodiment of the present invention. Figure 21 is an enlarged fragmentary isometric view similar to Figure 20 showing a fourth arrangement of the first embodiment of the present invention. Figure 22 is a fragmentary transverse section showing the vanes of the arrangement illustrated in Figure 21 in a closed condition. Figure 23 is a fragmentary isometric view of the arrangement shown in Figures 21 and 22 with the vanes in a closed condition. Figure 24 is an enlarged fragmentary transverse section taken through a window covering associated with the present invention. Figure 25 is an enlarged fragmentary section taken along line 25-25 of Figure 24. Figure 26 is a fragmentary isometric view of the arrangement shown in Figures 24 and 25. Figure 27 is a transverse section showing a fifth arrangement of the first embodiment of the present invention with the vanes in an open condition. Figure 28 is an enlarged fragmentary transverse section showing the juncture line between the vanes and the sheet of the arrangement shown in Figure 27. Figure 29 is a fragmentary transverse section showing the vanes of Figures 27 and 28 in a first closed condition. Figure 30 is a fragmentary transverse section similar to Figure 29 with the vanes in a reverse or second closed position. Figure 31 is a fragmentary transverse section of a sixth arrangement of the first embodiment of the present invention with the vanes in an open position. Figure 32 is an enlarged fragmentary transverse section showing the juncture line between the vanes and the attached sheet of the arrangement shown in Figure 31. Figure 33 is a fragmentary transverse section similar to Figure 31 with the vanes shifted into a closely adjacent side-by-side relationship. Figure 34 is a fragmentary isometric view of another arrangement associated with the present invention with the vanes being formed in accordance with the arrangement illustrated in Figures 1-11 but with the sheet being pleated between vanes. Figure 35 is a fragmentary isometric view of a seventh arrangement of the first embodiment of the present invention with the vanes in an open condition and being connected to the sheet in accordance with the embodiment shown in Figures 31-33 but with the sheet being pleated between vanes. Figure 36 is a fragmentary transverse section of the arrangement shown in Figure 34 with the vanes being open and moved into closely adjacent side-by-side relationship. Figure 37 is a fragmentary horizontal section of the embodiment shown in Figure 35 with the vanes being opened and shifted into a closely adjacent side-by-side relationship. Figure 38 is a fragmentary isometric view of a form of window covering associated with the present invention. Figure 39 is a fragmentary isometric view similar to Figure 38 but showing the opposite side of the window covering. Figure 40 is a fragmentary isometric view of the associated form showing the vanes from a rear side in a partially closed position. Figure 41 is a fragmentary isometric view similar to Figure 40 showing the front side of the window covering with the vanes in a partially closed position. Figure 42 is a fragmentary isometric view showing the vanes in a stacked relationship adjacent a head rail for the window covering. Figure 43 is an enlarged fragmentary section taken along line 43-43 of Figure 38. Figure 44 is an enlarged fragmentary section taken along line 44-44 of Figure 38. Figure 45 is an enlarged fragmentary isometric view showing one vane of the window covering illustrated in Figure 38 in an open condition. Figure 46 is a fragmentary isometric view of a rigid slat utilized in the vanes of the window covering shown in Figure 38. Figure 47 is a fragmentary isometric view showing the looped fabric adapted to receive the slat of Figure 46. Figure 48 is a fragmentary isometric view of a tape ladder used in operating the vanes of the window covering shown in Figure 38. Figure 49 is a fragmentary transverse section taken through a vane in a window covering associated with the present invention wherein support cords are fixed to a rear edge of the vanes. Figure 50 is a fragmentary isometric view of the arrangement shown in Figure 49 with a rigid slat being removed from the looped fabric pocket for the slat. Figure 51A is a fragmentary isometric view of a window covering associated with the present invention wherein a second sheet is affixed to a rear edge of the vanes. Figure 51B is a view similar to Figure 51A showing a multiple fold variation of the window covering. Figure 52 is a fragmentary isometric view of another shade associated with the present invention with the slats arranged in a vertical orientation. Figure 53 is a fragmentary isometric view of another arrangement of a shade associated with the present invention with the vanes in an open position. Figure 54 is an enlarged fragmentary section taken along line 54-54 of Figure 53. Figure 55 is a fragmentary isometric view of another arrangement of a shade associated with the present invention with the vanes in an open position. Figure 56 is an enlarged section taken along line 56-56 of Figure 55. Figure 57 is a fragmentary isometric view of another arrangement of a shade associated with the present invention with the vanes in an open position. Figure 58 is an enlarged section taken along line 58-58 of Figure 57. Figure 59 is a fragmentary isometric view of another arrangement of a shade associated with the present invention with the vanes in an open position. Figure 60 is an enlarged fragmentary section taken along line 60-60 of Figure 59. Figure 61 is a fragmentary isometric view of another arrangement of a shade associated with the present invention with the vanes in an open position. Figure 62 is an enlarged fragmentary section taken along line 62-62 of Figure 61. Figure 63 is a fragmentary isometric view showing another arrangement of a shade associated with the present invention. Figure 64 is an enlarged fragmentary section taken along line 64-64 of Figure 63. DESCRIPTION OF THE PREFERRED EMBODIMENTS A general arrangement of the window covering of the present invention is illustrated in Figures 1-3. In Figure 1, the window covering 54 can be seen to include a plurality of vertically extending vanes 56 formed off a rear face 58 of a fabric sheet 60. The vanes 56 are suspended from a head rail 62 containing a control system 64 which may be of the general type described in U.S. Patent No. 4,724,883 which is hereby incorporated by reference. The fabric sheet 60 is preferably made of a transparent or translucent material such as sheer. Figures 4-11 illustrate a particular form of sheet material. The vanes 56 are formed integrally with a virgin sheet of such fabric by vertically gathering the virgin sheet at horizontally spaced locations so as to form a plurality of equally spaced elongated loops 66 of fabric extending off a rear face of the sheet. The term "virgin sheet" is used herein to designate the piece of fabric material from which both the vanes 56 and the fabric sheet 60 itself are formed. The term "fabric sheet" herein designates the sheet like component of the completed window covering. The loops 66 of fabric have two layers which are then integrated together into a flat planar laminated form with a stiffening compound 68 so as to substantially rigidify the vanes relative to the soft fabric material from which the sheet 60 is made. An example of a stiffening compound which has been found suitable for the purpose is manufactured by Rohm & Haas of Philadelphia, Pennsylvania and marketed under type HA-16. Preferably, the double layered loops 66 of fabric and the stiffening compound 68 which together comprise the vanes 56 have some degree of opacity for reasons to be discussed hereafter. The substantially rigidified vanes 56 retain their flat planar form and are connected to vertical pivot shafts 70 at their top end at a location intermediate the front and rear edges 72 and 74 respectively of the vane. The pivot shafts 70 may be connected to the vanes in any suitable manner but preferably the shafts are provided with a notch 76 at their lower end, as best seen in Figure 9, so as to straddle the top edge 78 of the associated vane and then pinned to the vane. The shafts 70 are suspended from carriers 80 that are slidably positioned within the head rail 62 and moveable transversely of the window covering by a control cord 82. A second control cord 84 rotates the shafts 70 through the carriers 80 so that the vanes can be pivoted about longitudinal vertical axes extending through the shafts 70 between an open position wherein they extend substantially perpendicularly to the sheet 60 as illustrated in Figure 2 and a closed position wherein they lie in substantially parallel relationship with the sheet as illustrated in Figure 7. Due to the opacity of the vanes, when they are in the closed position of Figure 7, they substantially block the passage of light and vision through the window covering. The carriers 80 may be of the type disclosed in the aforementioned U.S. Patent No. 4,724,883. Figure 5 is a cross sectional view through a vane 56 formed in accordance with the above described procedure and it will be appreciated that the stiffening compound 68 penetrates both layers of the fabric vanes. If carefully selected quantities of the compound are utilized, however, the compound does not have to totally impregnate the fabric thereby leaving relatively soft outer surfaces on both sides of the vane. Figures 6-8 respectively show the relationship of the vanes 56 to the fabric sheet 60 in an open condition, a closed condition and an open condition wherein the vanes have been shifted to one side of a window opening (not shown) in closely adjacent relationship. Figures 9-11 are isometric views corresponding with Figures 6-8 respectively giving a better feel for the aesthetics of the window covering 54 in the three identified positions. It will be appreciated that natural living hinges or juncture lines 86 are established along the front edge 72 of the vanes at the junctures of the vanes 56 with the relatively soft fabric sheet 60 so that the vanes can be pivoted relative to the sheet while retaining the sheet in a substantially vertical orientation. To enhance the flexibility of the window covering along the juncture lines between the vanes and the fabric sheet, the vanes 87 in a preferred arrangement 88 of the invention are compressed as illustrated in Figures 12 and 13 along juncture lines 89. The compression indicated by reference numeral 90 collapses the fibers 91 in the fabric rendering the juncture line 89 relatively thin and more flexible than if the juncture line had not been compressed. Figures 14 and 15 illustrate this preferred arrangement 88 of an embodiment of the present invention with the vanes 87 in an open condition and a closed condition respectively. A second arrangement 92 of this embodiment of the present invention is illustrated in Figures 16-19. In this arrangement, the fabric sheet 94 is formed from integrated or bonded strips 96 of the same fabric material with the strips extending vertically and being interconnected to establish double layered vanes 98 formed from the same fabric. As is best illustrated in Figures 18 and 19, a front face 100 of each strip 96 is connected along one vertically extending edge 102 to the front face of an intermediate location on a next adjacent strip with a bonding medium 103 and its opposite vertically extending edge 104 is folded upon itself so as to form a loop 106, the layers of which are integrated with the stiffening compound 68 as in the first described arrangement 54. The vertically extending adjacent edges 102 and 104 of adjacent strips 96 are spaced slightly to define a single layer juncture line or living hinge 108 between the vanes 98 and the sheet 94. The single layer juncture line of course is more readily flexed than a double layer. Figure 17 shows an enlarged section of the juncture between adjacent strips 96 illustrating the regions in which the stiffening compound 68 is applied and the single layer juncture line 108 between the vanes and the sheet where no stiffening compound is used. Figure 20 shows a third arrangement 110 of this embodiment of the window covering of the present invention with this arrangement being very similar to that shown in Figures 16-19 but wherein a crease 111 is formed in the single layer of vanes 112 along a juncture line 113 so as to render the juncture line even more flexible. The crease can be made by compressing the fabric material or in the case of synthetics, the material can be heat creased along the juncture line. Figure 21 shows a fourth arrangement 114 of this embodiment of the present invention with this arrangement being very similar to that shown in Figures 16-19 but wherein a plurality of spaced elongated slots 115 are provided along a juncture line 116 between a vane 117 and an attached sheet 118 as illustrated in Figures 16-19. The slots again render the juncture line more flexible than the arrangement shown in Figures 16-19. Figures 22 and 23 are sectional and isometric views respectively of the arrangement shown in Figure 21 showing the relationship of the vanes 117 to the integrated strips of sheet material. Figure 24 shows an arrangement 119 of a shade associated with the present invention wherein vanes 120 are again formed from the same fabric material as a fabric sheet 122 and wherein the vanes are formed by gathering a virgin sheet along elongated horizontally spaced sections to form vertical loops 124 extending rearwardly from the fabric sheet. In this arrangement, however, the gathered loops 124 are rigidified with a stiffening compound 68 as in the earlier described arrangements but the layers of the looped vanes 120 are not bonded together but rather maintained in a spaced relationship. In fact, the loops are formed in an oval tubular configuration so as to lend structural rigidity to the vane in addition to the rigidity which is provided by the stiffening compound. This is more readily appreciated by reference to Figure 25 which shows the spaced rigidified layers of the fabric material at an intermediate location of a vane. The stiffening compound is preferably applied to the virgin sheet along the horizontally spaced sections before the loops are formed but alternatively the loops might be formed before the stiffening compound is applied. Figure 26 is an isometric view showing how the vanes can be interconnected with pivot shafts 126 for suspending the fabric sheet 122 and vanes 120 from a control system (not shown) as described in connection with the arrangement 54. The pivot shafts 126 are inserted into the upper open ends 128 of the vanes and are pinned to the vanes with transverse pins 130 that extend through both layers of the associated vane as well as the pin itself. Figures 27-30 illustrate a further arrangement 132 of the embodiment of the window covering of the present invention wherein vanes 134 while being formed of the same fabric material as a fabric sheet 136, are independently formed by folding strips of the fabric material back upon themselves so as to define a loop and then integrating the layers together with a stiffening compound 68 while leaving a free edge extension 138 of single layer for attachment to the sheet 136. The strips of fabric from which the vanes are formed may be different from that of the fabric sheet 136 but preferably for aesthetic purposes the fabrics are the same. The extension 138 is bonded to the sheet with any suitable adhesive 140 such as a hot melt adhesive manufactured and sold by EMS-American Grilon, Inc. of Charlotte, North Carolina under the brand name Grilltex. This provides a single layer hinge along the juncture line 142 between the vanes and the sheet for desired flexibility. Figures 27, 29 and 30 respectively show this arrangement of the invention in an open condition, a first closed condition and a second closed condition wherein the vanes are pivoted 180 degrees from the first closed position. In a sixth arrangement 144 of the embodiment of the present invention illustrated in Figures 31-33, fabric vanes 146 are again formed independently from a sheet 148 by forming a loop of fabric which has been folded back upon itself and bonded together with a stiffening compound 68 but wherein edges 150 of the strips of fabric from which the vanes are formed are aligned. The vanes are then connected to the fabric sheet 148 along one edge with a flexible ribbon type connector 152 of a material that is preferably as flexible or more flexible than the material from which the vanes are made. The interconnection of the vanes 146 to the fabric sheet by the ribbon like connector 152 is best seen in Figure 3 wherein the same face of the ribbon type connector is bonded to both the sheet 148 and one surface of the vane 146 with a bonding medium such as the previously mentioned hot-melt adhesive. It will be appreciated that the connector 152 could be connected to the vane in other ways such as by inserting the ribbon type connector 152 between the layers of the vane as shown in dashed lines. Figures 31 and 33 show the seventh arrangement of the window covering in section. In Figure 31 the vanes 146 are spaced to an optimum whereas in Figure 33 the vanes are in closely spaced relationship as when the window covering is shifted by the carriers to one side of a window opening (not shown) in which the window covering is mounted. Figure 34 shows another arrangement 154 of the window covering associated with the present invention wherein vanes 155 have been formed identically to the first arrangement 54 of Figures 1-11 but wherein a fabric sheet 156 is creased at 157 in parallel with the vanes at intermediate locations between each vane for a varied aesthetic appearance. This arrangement is shown in Figure 36 in section showing how the window covering would look when the vanes are open but shifted to one side in closely adjacent relationship. Figure 35 shows an eighth arrangement 158 of the embodiment of the window covering of the present invention with this embodiment being similar to the seventh arrangement 144 shown in Figures 31-33 but wherein a fabric sheet 159 has been creased along lines 160 parallel with vanes 161 at intermediate locations between the vanes. Figure 37 shows how the window covering of Figure 35 would look with the vanes in an open condition but shifted to one side of the window in which it is mounted in closely adjacent relationship. Figures 53 and 54 show an another arrangement 162 of the window covering associated with the present invention with this arrangement having a pair of substantially parallel transparent or translucent fabric sheets 164a and 164b and vanes 166 extending therebetween. The vanes are formed by gathering a virgin sheet, corresponding to the fabric sheets 164a, at spaced parallel locations to form loops 167 of the fabric material. Each loop has two layers of fabric and the layers are bonded together along a juncture line 168 where the loops are continuous with the fabric sheet 164a. The loops thereby define pockets into which relatively rigid elongated slats 170 of aluminum, plastic or the like are inserted to rigidify the vane. The loops 167 of fabric in combination with the slats 170 constitute the vanes 166. The fabric along the free edge 171 of each vane 166 so formed is connected to the other fabric sheet 164b as by bonding with a suitable adhesive or the like so that the vanes interconnect the two fabric sheets and retain a substantially uniform spacing therebetween. The vanes can be oriented vertically or horizontally and, in the case of a vertical orientation, controlled with an appropriate control mechanism of the type described previously in this application. In the case of a horizontal orientation, a control mechanism of the type disclosed in European patent application publications EP 0 494 501 (A2) and EP 058/489 (A2) could be used, which applications are hereby incorporated by reference. Figures 55 and 56 show another arrangement 172 of the window covering associated with the present invention where again a pair of transparent or translucent fabric sheets 174a and 174b are interconnected in substantially parallel spaced relationship by a plurality of parallel vanes 176. The vanes are formed in the same manner as the vanes in the embodiment shown in Figures 53 and 54 but the vanes are formed by gathering loops 178 of fabric off each fabric sheet rather than forming all of the looped vanes from one of the fabric sheets. The looped vanes 176 formed off each fabric sheet alternate so that adjacent vanes are formed off opposite sheets 174a and 174b. Again, the vanes are formed from the relatively soft fabric material of the fabric sheets and rigidified with an elongated relatively rigid slat 180 of aluminum, plastic or the like. The fabric along the free edge 181 of each vane is secured to the fabric sheet from which it is not formed as by bonding with a suitable adhesive. Again, the vanes can be oriented vertically or horizontally and the window covering would be operated with an appropriate control mechanism of the type described previously in this application. Figures 57 and 58 show another arrangement 182 of the window covering associated with the present invention which again includes a pair of spaced transparent or translucent fabric sheets 184a and 184b interconnected in substantially parallel relationship by a plurality of parallel vanes 186. The vanes in this arrangement are made by forming an independent loop 188 of fabric material such as of the type used for the fabric sheets, with the loop being closed. The loop 188 might simply be formed by folding a strip of such material back upon itself and adhesively bonding the free edges. A pocket is defined by the loop and an elongated relatively rigid slat 190 of aluminum, plastic or the like is inserted into the pocket. Opposite edges 191 of the vanes so formed are secured to the internal faces of the opposing fabric sheets 184a and 184b as by bonding with a suitable adhesive. Again, the vanes could be oriented vertically or horizontally and the window covering operated with an appropriate control mechanism of the type disclosed previously in this application. Figures 59 and 60 illustrate another arrangement 192 of the window covering associated with the present invention wherein the window covering again has a pair of substantially parallel translucent or transparent fabric sheets 194a and 194b interconnected by parallel vanes 196. In this arrangement, the vanes are formed by gathering strips of fabric off one face of a virgin sheet corresponding with the fabric sheet 194a so as to form parallel loops 198 of the fabric having two layers. The layers are then bonded together in a manner described previously in connection with the arrangement shown in Figures 1-11. The free edge 199 of each vane so formed is secured to the other fabric sheet 194b as with a suitable adhesive. Again, the vanes could be oriented horizontally or vertically and the window covering operated with an appropriate control mechanism of the type previously described in this application. Figures 61 and 62 show another arrangement 200 of the window covering associated with the present invention wherein again a pair of transparent or translucent fabric sheets 202a and 202b are retained in substantially parallel relationship by a plurality of parallel vanes 204. In this arrangement, the vanes are formed in the same manner as the arrangement illustrated in Figures 59 and 60 except the vanes are formed alternately from each fabric sheet 202a and 202b such that adjacent vanes 204 are formed from opposite fabric sheets. As with the arrangement shown in Figures 59 and 60, the free edge 206 of each vane is secured to the fabric sheet 202a or 202b with a suitable adhesive. Again, the vanes could be oriented vertically or horizontally and the window covering would be operated with a control mechanism of the type previously described in this application. Figures 63 and 64 show another arrangement 208 of the window covering associated with the present invention wherein the window covering includes a pair of substantially parallel transparent or translucent fabric sheets 210a and 210b secured together by a plurality of parallel vanes 212. In this arrangement, the vanes are made by forming independent loops of a fabric material utilizing, for example, the fabric from which the fabric sheets are made. The loops may be formed by folding strips of the material back upon themselves and bonding each layer of the loop together with a stiffening compound so that the vanes maintain a fixed substantially planar configuration. The opposite edges 214 of the vanes so formed are then secured to internal faces of the opposing fabric sheets 210a and 210b as by bonding with a suitable adhesive. Again, the vanes could be oriented vertically or horizontally and the window covering would be operated with an appropriate control mechanism of the type previously described in this application. It will be appreciated that with any of the aforedescribed arrangements of the first embodiment of the present invention the vanes could have more than two layers of fabric by forming multiple closely adjacent or contiguous folds 215. An illustrative example of such an arrangement forming a variation of the arrangement of Figures 1-11 is shown in Figure 6B. Figures 38-48 show another arrangement 216 of a window covering associated with the present invention wherein a fabric sheet 218 of material is integrally connected with vanes 220 protruding off a rear face 222 of the sheet 218 and with the sheet and vanes being supported in a head rail 224 by a control system 226 of the type conventionally used with venetian blinds. As probably most clearly illustrated in Figures 45-48, the vanes 220 are formed at vertically spaced locations along the sheet 218 by gathering a virgin sheet so as to form the fabric sheet 218 and rearwardly projecting and horizontally extending loops defining pockets 228 into which slats 230 of aluminum, plastic or the like are inserted. The two layers of each pocket are bonded together along a horizontal juncture line 232 adjacent to the sheet to form a living hinge thereby allowing the vanes to pivot relative to the sheet. The slats 230 provide the rigidity desired for operation of the window covering. At longitudinally spaced locations along the length of each slat 230, a transverse slot 234 is cut through the slat and this slot is aligned with a larger slot 236 cut into the fabric pocket 228 from the rear edge 238 of the pocket to a location closely adjacent to the juncture line 232. Slots 234 and 236 are provided at each location where a vertically extending tape ladder 240, as conventionally used in venetian blinds, is to be located. The tape ladders 240 consist of a pair of longitudinal or vertically extending stringers 242 that are interconnected at vertically spaced locations by cross rungs 244 and the cross rungs are disposed beneath each vane 220. The stringers are disposed along opposite side edges of each slat in alignment with the slot 234 in the slat and a vertical lift cord 246 is interwoven through the rungs of the tape ladder in a conventional manner to lift the slats from a vertically spaced orientation, as shown for example in Figures 38 and 40 to a stacked relationship adjacent the head rail 224 as illustrated in Figure 42. The lift cord is interwoven through the cross rungs 244 in a manner known in the industry and as clearly illustrated in U.S. Patent No. 5,349,730 which is of common ownership with the present application and the disclosure therein is hereby incorporated by reference. A bottom rail 248 which is relatively heavy in comparison to the slats 230 is suspended beneath the lowermost vane 220 and is conventionally interconnected with the tape ladder and the lift cord. Manipulation of the tape ladder and lift cord by a conventional control system 250 that is only partially illustrated moves the vanes between open and closed angular positions where they are substantially perpendicular to or parallel with the fabric sheet 218 respectively and spaced or stacked positions as mentioned above. With reference to Figure 38, a continuous beaded cord 252 is provided to reciprocally shift the stringers 242 of the tape ladders in vertical directions so that the vanes are tilted in one direction or the other while a pull cord 254 is operatively attached to the lift cord 246 and can be manually manipulated to raise the vanes from the spaced position of Figure 39 to the stacked position of Figure 42. Of course, conventional brake systems (not shown) are provided within the control system to retain the vanes in the stacked relationship of Figure 42 when desired. The fabric sheet 218 is preferably made of a transparent or translucent material such as sheer while the vanes 220 are preferably opaque through the use of aluminum, plastic or other suitable slat material which prevents the passage of light and vision through the window covering when the vanes are in a closed position. Of course, when the vanes are extended substantially perpendicularly to the sheet in the open condition as shown in Figures 38 and 39, both light and vision are permitted through the window covering. While the fabric sheet 218 has been illustrated as being horizontally pleated at intermediate locations between vanes, the pleats may be removed for varied aesthetics. Figures 49 and 50 show a further arrangement 256 of a window covering associated with the present invention where again a virgin sheet of fabric material is gathered to form a sheet 258 and fabric loop type pockets 260 for relatively rigid slats 262 but wherein the vanes 264 are not supported with tape ladders as in the first described arrangement 216 of the second embodiment but rather are supported at a rear edge by spaced vertically extending support coras 266. The cords 266 are secured to the rear edge 268 of each vane at horizontally spaced locations in any suitable manner. Suitable examples for attaching cords of this type to the rear edge of the vanes are illustrated in U.S. Patent No. 4,928,369 which is herein incorporated by reference. The control system (not shown) for the arrangement shown in Figures 49 and 50 would include means for vertically shifting the support cords 266 reciprocally relative to the sheet 258. Such movement of the cords tilts the vanes as desired between an open position wherein they extend substantially perpendicularly to the fabric sheet and a closed position wherein they extend substantially parallel to the fabric sheet. Means may also be provided in the control system for lifting the entire window covering into a head rail (not shown) by rolling the sheet and vanes about a roller. Control systems suitable for this purpose are known in this art. Further arrangement 270 of the window covering associated with the present invention is illustrated in Figure 51 wherein a virgin sheet is again gathered at spaced locations to form a fabric sheet 272 and looped fabric pockets 274 having relatively rigid slats 276 inserted therein but wherein a second sheet 278 is bonded or otherwise affixed to a rear edge 280 of the vanes with any suitable adhesive. The sheets 272 and 278 may be suspended by a control system (not shown) that allows the sheets to be vertically and reciprocally moved relative to each other to shift the vanes between open and closed positions and may also include a roller around which the sheets and the vanes can be wrapped to lift the window covering vertically out of the window opening in which it is mounted. A suitable control system may be of the type described in the afore-noted European patent application publications EP 0 494 501 (A2) and EP 0 581 489 (A2). Preferably, the sheets 272 and 278 would be made of transparent or translucent material such as sheer while the vanes again would be opaque due to the preferably opaque nature of the slats utilized therein. Figure 52 illustrates another arrangement 282 of the window covering associated with the present invention wherein the window covering includes a fabric sheet 283 and vanes 284 which are oriented vertically but again formed by gathering material from the virgin sheet corresponding to the fabric sheet 283, and looping the material in order to define a fabric pocket 286 in which a rigid slat 288 is inserted. The two layers of each vane are bonded together along a juncture line 290 adjacent to the fabric sheet 283. The vanes are supported at a top edge 292 by a shaft 294 which may be notched at 296 to receive the top edge of a vane and secured thereto with a pin 298 so that the shaft can be conventionally supported by a carrier (not shown) of the type disclosed more fully in the aforementioned U.S. Patent No. 4,724,883. These carriers, as mentioned previously, are operative to either pivot the vanes between open and closed positions wherein they lie substantially perpendicularly or in parallel relationship with the fabric sheet respectfully and can also be shifted to one side of the window in which the window covering is mounted. It will be appreciated that with any of the aforedescribed arrangements, the vanes could have more than two fabric layers by forming multiple closely adjacent or contiguous folds 300 within one of which is inserted a rigid slat 302. An illustrative example of such an arrangement forming a variation off of the arrangement of Figure 51A is shown in Figure 51B. Unless the context requires otherwise, throughout the specification and claims which follow, the word "comprise" and variations thereof, such as, "comprises" and "comprising" are to be construed in an inclusive sense, that is as "including, but not limited to". The various arrangements and embodiments of the present invention all include at least one soft transparent or translucent sheet and a plurality of rigid parallel vanes projecting away from the sheet. The vanes can be formed in various ways and operated in various manners depending upon whether the vanes are horizontally or vertically oriented. The features described in connection with each arrangement of the invention are interchangeable to some degree so that many variations beyond those specifically described are possible.

Claims: An article (162; 192) for use in fabricating a window covering assembly, comprising: a first sheet (164b; 194b) and a second sheet (164a; 194a) each having a width dimension and a longitudinal axis, said first and second sheets being spaced from one another, a plurality of longitudinally spaced vanes (166; 196) extending between said first and second sheets, each of said vanes (166; 196) being formed with a first side having opposed first and second ends (171; 199, 168) and a second side having opposed first and second ends, said first ends (171; 199) of said first and second sides being connected to said first sheet and said second ends (168) of said first and second sides being connected to the second sheet, said first and second sides of each said vanes extending substantially parallel to one another between said first and second sheets; characterised in that all of said vanes are each formed by folding a portion of said second sheet upon itself and joining it to form a plurality of substantially flattened loops (167; 198) thereby defining said first side and said second side having a free edge defined by said first ends (171; 199) and a juncture edge defined by said second ends (168). The article of claim 1 in which each of said vanes (166) forms a pocket along the width of said first and second sheets defining a space between said first and second sides thereof, said space within each of said pockets extending at least partially between said first and second ends (171, 168) of said sides. The article of claim 2 in which a slat (170) is inserted within said space in said pocket of each of said vanes (166). The article of claim 3 in which each of said slats (170) is substantially rectangular in shape and extends across said width dimension of said first and second sheets. The article of claim 3 or 4 in which each of said slats (170) is removable from said pockets of said vanes and replaceable with another slat. The article of claim 3 in which said slat (170) is affixed to the the second sheet defined by said loop (167). The article of any preceding claim in which said first sheet (164b; 194b) is defined by a continuous sheet of material, and said second sheet (164a; 194a) is defined by a plurality of connector sections located between and affixed to immediately adjacent ones of said spaced vanes (166; 196). The article of claim 7 in which said first side of each of said vanes is connected to one of said connector sections, and said second side thereof is connected to an immediately adjacent connector section. The article of claim 7 in which said first and second sides of each said vanes are connected to each other at said juncture edge (168) of said vanes. The article of claim 9 in which said first and second sides of each said vanes are connected to one another so that adjacent connector sections are disposed in substantially the same plane. The article of claim 9 in which said second ends (168) of said first and second sides of each said vanes (166; 196) are interconnectied by bonding. The article of claim 11 in which said second ends (168) of said first and second sides of each said vanes (166; 196) are interconnectied by a bead of adhesive. The article of any preceding claim in which said free edge (171; 199) of each said vanes (166; 196) is connected to said first sheet (164b; 194b) by bonding.

Inventors: ANDERSON RICHARD N, COLSON WENDELL B, FRASER DONALD E, SWISZCZ PAUL W, THRONE JASON T, ANDERSON, RICHARD N., COLSON, WENDELL B., FRASER, DONALD E., SWISZCZ, PAUL W., THRONE, JASON T.
Applicants: HUNTER DOUGLAS INTERNAT NV, HUNTER DOUGLAS INTERNATIONAL NV
Application year: 1994
Main classification: E06B9
IPC codes: E06B9